ChromeOS: Fix removeUser button on signin screen.

components/user_manager/remove_user_delegate.h

Index: components/user_manager/remove_user_delegate.h
diff --git a/components/user_manager/remove_user_delegate.h b/components/user_manager/remove_user_delegate.h
index 1077bda527fa6f11b4c82c43e7dd113d9d125bd8..6659f0a81988e6f10c931182888d45e8edec5579 100644
--- a/components/user_manager/remove_user_delegate.h
+++ b/components/user_manager/remove_user_delegate.h
@@ -7,16 +7,18 @@
 
 #include "components/user_manager/user_manager_export.h"
 
+class AccountId;
+
 namespace user_manager {
 
 // Delegate to be used with |UserManager::RemoveUser|.
 class USER_MANAGER_EXPORT RemoveUserDelegate {
  public:
   // Called right before actual user removal process is initiated.
-  virtual void OnBeforeUserRemoved(const std::string& username) = 0;
+  virtual void OnBeforeUserRemoved(const AccountId& account_id) = 0;
 
   // Called right after user removal process has been initiated.
-  virtual void OnUserRemoved(const std::string& username) = 0;
+  virtual void OnUserRemoved(const AccountId& account_id) = 0;
 };
 
 }  // namespace user_manager